forked from sin365/AxibugEmuOnline
129 lines
3.2 KiB
C#
129 lines
3.2 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper162 Pocket Monster Gold //
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//////////////////////////////////////////////////////////////////////////
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using VirtualNes.Core.Debug;
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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namespace VirtualNes.Core
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{
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public class Mapper162 : Mapper
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{
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BYTE reg5000;
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BYTE reg5100;
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BYTE reg5200;
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BYTE reg5300;
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public Mapper162(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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reg5000 = 0;
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reg5100 = 0;
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reg5200 = 0;
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reg5300 = 7;
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SetBank_CPU();
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SetBank_PPU();
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}
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//void Mapper162::WriteLow(WORD addr, BYTE data)
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public override void WriteLow(ushort addr, byte data)
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{
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if (addr == 0x5000)
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{
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reg5000 = data;
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SetBank_CPU();
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SetBank_PPU();
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}
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else if (addr == 0x5100)
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{
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reg5100 = data;
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SetBank_CPU();
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SetBank_PPU();
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}
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else if (addr == 0x5200)
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{
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reg5200 = data;
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SetBank_CPU();
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SetBank_PPU();
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}
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else if (addr == 0x5300)
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{
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reg5300 = data;
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}
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else if (addr >= 0x6000)
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{
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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else
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{
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Debuger.Log($"write to {addr:X4}:{data:X2}");
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}
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}
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void SetBank_CPU()
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{
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BYTE bank = 0;
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switch (reg5300)
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{
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case 4:
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bank = (byte)((((reg5000 & 0xF) + ((reg5100 & 3) >> 1)) | ((reg5200 & 1) << 4)));
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break;
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case 7:
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bank = (byte)(((reg5000 & 0xF) | ((reg5200 & 1) << 4)));
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break;
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}
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SetPROM_32K_Bank((byte)bank);
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}
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void SetBank_PPU()
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{
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SetCRAM_8K_Bank(0);
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}
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//void Mapper162::HSync(int scanline)
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public override void HSync(int scanline)
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{
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if ((reg5000 & 0x80) != 0 && nes.ppu.IsDispON())
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{
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if (scanline < 127)
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{
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// SetCRAM_4K_Bank(0, 0);
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SetCRAM_4K_Bank(4, 0);
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}
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else if (scanline < 240)
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{
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// SetCRAM_4K_Bank(0, 1);
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SetCRAM_4K_Bank(4, 1);
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}
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}
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}
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//void Mapper162::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg5000;
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p[1] = reg5100;
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p[2] = reg5200;
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p[3] = reg5300;
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}
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//void Mapper162::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg5000 = p[0];
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reg5100 = p[1];
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reg5200 = p[2];
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reg5300 = p[3];
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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